Hahaha, yeah I had this problem also the first time round.
You'll find the nut under the actual "sprinter" logo on the wheel. Just get like a flathead screwdriver and jam it along the edged of the badge, and you'll find that it's like a secret compatment underneath.
Just make sure you actually jam the screwdriver along the actual edge of the cover, cus the first time i did mine, i just did it along the badge, and took the badge off, but not the cover...![]()